Red Bull sweats over Ricciardo powerplay

RED Bull say they're prepared to wait for Daniel Ricciardo to decide his Formula One future but have Spaniard Carlos Sainz as a 'safety net' if he opts to leave after 2018.

Team boss Christian Horner told reporters on Monday that he wanted the Australian star to stay alongside Dutch 20-year-old Max Verstappen, who has a long-term contract.

Ricciardo will be in the final season of a five-year deal next year and has been linked to Mercedes and Ferrari in media speculation.

"The next move he makes at 28 years of age is a very important one for him. So of course I'm sure he's going to take the time to make sure the decision is right for him," said Horner.

"But he knows the intent very clearly, and I've discussed it with him, is that we want him in the team. If that takes another six months, then so be it." Verstappen won the Mexican Grand Prix on Sunday, his second victory of the season, while Ricciardo celebrated victory in Azerbaijan in June. Riccirado is fourth in the season standings amid a season that's included eight other podium placings while Verstappen is sixth.

The Australian's race in Mexico ended after barely a handful of laps, however, with a turbo problem.

"I think he's keen to see what engine performance looks like next year, which is understandable," said Horner.

Red Bull says they have a safety net under Daniel Ricciardo.

Red Bull used Renault engines, branded Tag Heuer. While the former champions have won three times this year and taken more points than Ferrari in recent races, they have also suffered frequent failures.

And now we play the waiting game.

"He knows how we go about our racing and how we treat the two drivers, which he's extremely comfortable and happy with," Horner said of Ricciardo. "I think, as his character has developed and as his personality has come across, he sees the fit between Daniel Ricciardo and Red Bull.

"I think he sees the capability that we have within the team. And I think he's very happy in the team." Asked what would happen if Ricciardo decided to leave, Horner said Red Bull were prepared for that.

"That's why we kept Carlos Sainz on loan, that's why we have options around us. We have a safety net but our number one objective is to retain the pairing that we have," he said.

Sainz has been loaned from Toro Rosso to Renault as part of an engine deal that allowed the Red Bull-owned team to end a contract with the French manufacturer and partner Honda next season.